Implemented review comments.

Author: pravesh-sharma

web/pgadmin/tools/erd/static/js/erd_tool/components/MainToolBar.jsx

@@ -7,6 +7,7 @@
 //
 //////////////////////////////////////////////////////////////
 import React, {useCallback, useEffect, useState} from 'react';
+import _ from 'lodash';
 import { styled } from '@mui/material/styles';
 import { Box, useTheme } from '@mui/material';
 import { PgButtonGroup, PgIconButton } from '../../../../../../static/js/components/Buttons';
@@ -164,7 +165,13 @@ export function MainToolBar({preferences, eventBus, fillColor, textColor, notati
         isDirtyRef.current = isDirty;
         setDisableButton('save', !isDirty);
         if((isDirty || fileName) && isSaveToolDataEnabled('ERD')){
-          setSaveERDData({data, fileName, isDirty, toolbarPrefs});
+          setSaveERDData((prev) => ({
+            ...prev,
+            data,
+            fileName,
+            isDirty,
+            ...(toolbarPrefs !== undefined && { toolbarPrefs }),
+          }));
         }
       }],
     ];